In enterprise environment there is a strong need to have tight security on WIFI enabled networks. That includes methods of 802.1x authentication. For example Microsoft Internet Authentication Server (MS IAS). You can allow users to access WIFI by allowing some domain group to get authenticated by Kerberos protocol. That is done under IAS MMC console--->Remote acces policies-->Radius policy. In that case users are connected to wifi after loging into their PC via cached credentials. If you need to have connection working before user logs in than if you are using Microsoft IAS as radius server it's possible to add both domain users and domain computers as a group allowed to authenticate. In this case every domain computer can access and connect to the wifi.